owner - 1 month advance rent not returned by owner

I rented a flat for 11 months but due to financial reasons decided to vacat the flat after 4 monthes. @ 1st January 2012 to 30the April 2012 We have provide a written 1 month Notice to owner before vacating the flat.

After 2 months of regress followup with brokers and owner, they have returned only INR 60,000.00 of as security deposit and but still my advance one monthly rent of INR 14,000.00 for month of May 2012, submitted by cheque to owner in advance, was an-cash by owner on 7the May 2012 is not returned. We never stayed in the flat for month of May and he is charging us rent for month of may.

We have done several follow-ups with owner and Broker to return my money, but every time a false assurances is given and says he is busy withe otheer cases., Now they say since thee keys are submitted by me on thee 1 st on may to broker, he will not returned my 1 monthe rent. which is just a 1 day late, as I vacated the house on 30th April.

Plesae advice how can I get my money back